Territories are a huge part of Planet IX and are split up into six categories: the first and smallest being a single PIX. Each territory requires more connected PIX next to each other, until you finally reach the largest stage of a domain. When you reach the territory level Area, you’ll start receiving rewards from your territory through staking. The larger the territory you stake - the higher rewards you receive.
Later on you'll be able to form Territories by merging them with one another i.e merging two zones creates a domain. By doing so, splitting both ownership and rewards with other AoCs. Sharing is caring (and also kind of strategic).
Territory Matrix